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use super::{Route, Captures};

use http::Request;

/// A set of routes
///
/// Matches an HTTP request with a route, which in turn maps to a resource
/// method.
#[derive(Debug)]
pub struct RouteSet<T> {
    routes: Vec<Route<T>>,
}

// ===== impl RouteSet =====

impl<T> RouteSet<T> {
    /// Create a new, empty, `RouteSet`.
    pub fn new() -> RouteSet<T> {
        RouteSet { routes: vec![] }
    }

    pub(crate) fn map<F, U>(self, f: F) -> RouteSet<U>
    where F: Fn(T) -> U,
    {
        RouteSet {
            routes: self.routes.into_iter().map(|r| r.map(&f)).collect()
        }
    }

    pub(crate) fn insert(&mut self, route: Route<T>) {
        self.routes.push(route);
    }

    pub(crate) fn insert_all(&mut self, set: RouteSet<T>) {
        self.routes.extend(set.routes);
    }
}

impl<T> RouteSet<T>
where
    T: Clone,
{
    /// Match a request against a route set
    pub(crate) fn test(&self, request: &Request<()>) -> Option<(T, Captures)> {
        self.routes
            .iter()
            .flat_map(|route| route.test(request))
            .next()
    }
}